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Read More . . . L-tyrosine can be converted by neurons in the brain to dopamine and norepinephrine (noradrenaline), hormones, which are depleted by stress, overwork and certain drugs. By replenishing norepinephrine in the brain, mental energy levels are enhanced and a feeling of contentment often occurs. Because of the liver conversion necessary for L-phenylalanine to have these effects, L-tyrosine is often faster acting. In addition, the conversion step from L-tyrosine to norepinephrine may be enhanced if the cofactors (vitamins B6 and C) are included. Some of the norepinephrine will also be converted to epinephrine (adrenaline) in the brain's adrenal medulla by use of S-adenosylmethionine (SAMe) as a methylating agent. Since both norepinephrine and epinephrine can cause smooth muscle (arterial) contraction, care with blood pressure should be taken when supplementing L-phenylalanine or L-tyrosine. L-tyrosine is also a precursor of two thyroid hormones. D-phenylalanine is unique among amino acids because the D-form (normally not found in life) has biological activity that is different from its L-stereoisomer. D,L-phenylalanine is a 50/50 mixture of the two stereoisomers. Supplement Facts Serving Size: 1 Teaspoon (2.7 grams) Amount Per Serving: DL-Phenylalanine - 2700mg Dosage and Use Suggested dose is 500 to 1000 mg in the morning or afternoon. More may be necessary for increasing the feeling of well-being. These products are most effectively utilized when taken on an empty stomach mixed with juice or water. Adequate co-factors (vitamins B6 and C) should also be taken if not included with the product. Caution: Cancer patients should avoid taking L-phenylalanine and L-tyrosine. Certain cancers, such as melanoma, depend on these amino acids to fuel their growth. Supplemental use of L-phenylalanine and L-tyrosine may raise or normalize blood pressure. Insomnia may occur from over-stimulation if taken too close to bedtime. How to Order To order online, click on the "Order" box below. To see a list of all supplements, please check our Index or use our Search feature. If you have any questions, please contact us at info@lifeextensionvitamins.com or 1-888-771-3905. |
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